________________________________ From: George Nychis <[EMAIL PROTECTED]> To: Bill Stevenson <[EMAIL PROTECTED]> Cc: [email protected] Sent: Thursday, November 20, 2008 8:17:17 PM Subject: Re: [Discuss-gnuradio] does USRP need some warm up before it gets into its normal state? Thank you George! Do you know how many samples I should throw away because sometimes it appeares to be 2 samples, while other times it appears to be 10 samples? Could Matt tell me what the size of the first set would be? Thank you! Bill Bill Stevenson wrote: > Hello, all! > > I am using demo file benchmark_tx.py and benchmark_rx.py to test the average > PER at a certain distance. Whenever I initiated a test, the first two or > three PER varied violently. For example, the expected PER is around 4%, in > the first three tests, PER might be 30% and after the first three tests, each > PER in each test would change within a constant range, say 4%. Does USRP need > some warm up before it goes to its stable state? > It's a known issue with the USRP that there is a power spike when initializing. I forget the exact cause of this, Matt would probably know. I would throw away the first set of samples. - George
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